I know how you feel!! I had a missed m/c at 12 weeks, and I didn't have a clue until I started spotting a small bit, still thinking maybe I was OK, but it all went downhill fast. When I see people posting how by 8-9 weeks they'd know by now if something was wrong, it makes me feel bad for them, because NO you don't always know by then. I went from a small amount of spotting, to having no baby in my belly by the end of the day, it was terrible!